Treatment method for reverse osmosis concentrated-water of landfill leachate

Abstract

The invention discloses a treatment method for reverse osmosis (RO) concentrated-water of landfill leachate. The method comprises the following steps: after the RO concentrated water enters a CFR forflocculation catalytic treatment, CFR effluent water is subjected to mud-water separation through a sedimentation tank, the supernatant is subjected to built-in ultrafiltration, the effluent water enters an ED system for desalting, the obtained desalted water enters an ozone catalytic oxidation device, the effluent water flows back to an original landfill leachate biochemical system, and the obtained concentrated brine enters an activated carbon adsorption tank to be discharged out or evaporated to dryness without discharge. The method disclosed by the invention can effectively separate organic matter and salts in the RO concentrated water, greatly improve biodegradability of the organic matter, and effectively reduce a concentration of RO concentrated-water pollutants; the desalted RO concentrated water flows back to the original landfill leachate biochemical system without recharge or return spraying, and treatment efficiency of wastewater is improved while secondary pollution is reduced; and in addition, compared with the prior art, the method disclosed by the invention has small activated carbon consumption, a less yield of hazardous waste, a membrane not easy to pollute and block, and significantly-reduced investment and operating costs of treatment of the RO concentrated water.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a reverse osmosis concentrated water treatment method for garbage permeate. Background technique [0002] Landfill leachate contains high concentrations of organic matter, heavy metals, chemical oxygen demand (COD), ammonia nitrogen, and suspended solids (SS) and other pollutants. It is an organic wastewater that will seriously pollute water, soil, and the atmosphere. It must be passed through Discharge after treatment. At present, relatively mature landfill leachate treatment processes include: pre-treatment such as anaerobic + aerobic membrane bioreactor (MBR) process, advanced treatment such as double-membrane (NF + RO) process. However, the concentrated liquid produced by membrane treatment is more polluting, and the treatment methods of recharge and landfill are mostly used now, but this will lead to the continuous accumulation of pollutants in the system, which wi...

AI Technical Summary

Problems solved by technology

However, since most of the refractory organic matter in RO concentrated water is removed by the activated carbon adsorption bed, frequent replacement and supplementation of activated carbon is required, so there are problems such as large consumption of activated carbon, large amount of hazardous waste generation, high energy consumption, and easy fouling of the membrane.

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